无法访问 [AnyHashable:Any] 类型的值 - Swift 4

Question

我正在尝试从类型为 [AnyHashable: Any] 的变量访问特定值，但是，我在访问任何值时遇到错误。我已经浏览了有关此问题的互联网，但没有找到任何具体的解决方案。那么有没有其他方法可以访问它们？请帮助并提前致谢。

出现错误的函数

func application(_ application: UIApplication, didReceiveRemoteNotification userInfo: [AnyHashable : Any], fetchCompletionHandler completionHandler: @escaping (UIBackgroundFetchResult) -> Void) {
        if let messageID = userInfo[gcmMessageIDKey] {
            print("Message ID: \(messageID)")
        }
        //Print full message
        print(userInfo)

        guard let aps = userInfo[AnyHashable("gcm.notification.data")],
            let data = aps["filters"] as! String else { // Getting the error here
                return
        }
        print(aps)
        completionHandler(UIBackgroundFetchResult.newData)
    }

获取打印用户信息的数据

[AnyHashable("gcm.notification.data"): {"filters":"fjjnbbx zjbxzj","history":"dsfdxf","message":"value1","source":"message source"}]

Answer 1

从[AnyHashable("gcm.notification.data")]获取数据

if let aps = userInfo["aps"] as? NSDictionary, let notificationData = userInfo["gcm.notification.data"] as? NSString {

          var dictonary:NSDictionary?
            if let data = notificationData.data(using: String.Encoding.utf8.rawValue) {
                do {
                    dictonary = try JSONSerialization.jsonObject(with: data, options: []) as? NSDictionary

                    if let alertDictionary = dictonary {
                        print(alertDictionary)
                    }
                } catch{
                    print(error)
                }

Answer 2

我解决了这个问题，因为我收到的信息是 NSString 类型（JSON in String），而不是 NSDictionary / [String : Any]。我在下面提供了解决我的问题的工作代码 -

if let notificationData = userInfo["gcm.notification.data"] as? NSString {
                var dictionary : NSDictionary?
                if let data = notificationData.data(using: String.Encoding.utf8.rawValue) {
                    do {
                        dictionary = try JSONSerialization.jsonObject(with: data, options: []) as? NSDictionary
                        print("DICTIONARY : \(dictionary)")
                        if let dict = dictionary {
                            print(dict["alert_message"] as? String)
                            // ..... and so on
                        }
                    } catch let error as NSError {
                        print("Error: \(error)")
                    }
                }
            }

无法访问 [AnyHashable:Any] 类型的值 - Swift 4

Unable to access values of type [AnyHashable:Any] - Swift 4

push-notification

userinfo

ios

swift